Add getVersion and setLibraryDebuggable RPCs to the service protocol.

runtime/observatory/lib/service_common.dart

Index: runtime/observatory/lib/service_common.dart
diff --git a/runtime/observatory/lib/service_common.dart b/runtime/observatory/lib/service_common.dart
index 50774c42c1bd2053056001d0872f59c13bf3c118..790efe1b3057982fe558db3f6f866003fcd24c56 100644
--- a/runtime/observatory/lib/service_common.dart
+++ b/runtime/observatory/lib/service_common.dart
@@ -76,9 +76,7 @@ abstract class CommonWebSocket {
 }
 
 /// A [CommonWebSocketVM] communicates with a Dart VM over a CommonWebSocket.
-/// The Dart VM can be embedded in Chromium or standalone. In the case of
-/// Chromium, we make the service requests via the Chrome Remote Debugging
-/// Protocol.
+/// The Dart VM can be embedded in Chromium or standalone.
 abstract class CommonWebSocketVM extends VM {
   final Completer _connected = new Completer();
   final Completer _disconnected = new Completer<String>();